Coupled donors in quantum dots: quantum size and dielectric mismatch effects
comunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
comunitat-uji-handle4:
INVESTIGACIONMetadata
Title
Coupled donors in quantum dots: quantum size and dielectric mismatch effectsDate
2009Publisher
American Physical SocietyISSN
1098-0121Bibliographic citation
MOVILLA, J. L.; BALLESTER, A.; PLANELLES, J. Coupled donors in quantum dots: quantum size and dielectric mismatch effects. Physical Review B, 2009, vol. 79, no 19, p. 195319.Type
info:eu-repo/semantics/articlePublisher version
http://link.aps.org/doi/10.1103/PhysRevB.79.195319Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Spatial and dielectric confinement modulations of the spontaneous emission rates, transition energies, and charge-density distributions of a singly ionized double donor system (D2+) in a spherical quantum dot are ... [+]
Spatial and dielectric confinement modulations of the spontaneous emission rates, transition energies, and charge-density distributions of a singly ionized double donor system (D2+) in a spherical quantum dot are calculated within the framework of the effective-mass envelope function approximation. Dipole moments, energy splittings, transition moments, electron-density distributions, and spontaneous emission rates involving bonding and antibonding lowest-lying molecular states are addressed for different dielectric environments, quantum dot radii, and relative locations of the coupled impurities inside the dot. The results indicate that the donor molecule behaves as heteropolar when the spatial confinement breaks the inversion symmetry, which is paralleled by a strong reduction in the excited-state radiative lifetime. Dielectric confinement, acting on a larger length scale than spatial confinement, may recover the bulklike homopolar character when the dot is embedded in a low dielectric constant medium. In the weak spatial confinement regime, dielectric effects can increase the corresponding bulk radiative lifetimes significantly and simultaneously modulate the charge-density distribution [-]
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Physical Review, Series B, 2009, v. 79, n. 19Rights
© American Physical Society
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